Thionamide-induced neutropenia and ecthyma in a pregnant patient with hyperthyroidism

Background: Agranulocytosis is known to be a rare side effect of thionamides. This complication puts pregnant patients at particular risk for infections. Obstetricians caring for such patients have the difficult task of deciding between conservative or surgical management. Case: The patient is a 37-year-old gravida 4 para 3 Hispanic woman at 11 weeks of gestation with recently diagnosed hyperthyroidism who presented with a neutropenic fever and ecthyma as a complication of thionamide use. She subsequently underwent a thyroidectomy and then had a spontaneous abortion on postoperative day 2. Conclusion: This patient had life-threatening thyrotoxicosis complicated by neutropenic fever and infection, likely caused by a reaction to thionamides. She quickly recovered with broad-spectrum antibiotics. She could not be restarted on methimazole or propylthiouracil as a result of agranulocytosis and thus underwent thyroidectomy.